Pulverizer.



l H. A. GOBTZ.

' PULvBRIzER. APPLICATION FILED HAY 5, 1908.

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Patented Jan -4, 1910.

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/m/en for1 ma HAwm H. A. GOETZ.

PULVERIZER.

APPLICATION FILED MAY 5,1908.

Patented Jan.4, 1910.

2 SHEETS-SHEET 2.

anuantoz with n ,thefollowing is UNITED sTATEs PATENT OFFICE.

HENRY A. GOETZ, 0F NEW ALBANY, INDIANA, ASSIGNOR TO AMERICAN PULVERIZERCOMPANY, 0F ST. LOUIS, MISSOURI, A CORPORATION 0F MISSOURI.

PULVERIZER.

I Specification of Letters Patent.

Patented J an. 4, '1910.

Application tiled May 5, 1908. Serial No. 431,035.

To all whom itmay concern:

'4 Be it known-that I, .HENRY A. GoETz, a citizen of the United States,residing at New Albany, in the county of Floyd and State of Indiana,have invented certain new and useful Improvements in Pulverizers, ofwhich a specification, reference being had therein to the accompanyingdrawing.

This invention relates to pulverizi'no machines and has for its objectto provi e improved hammer mechanism, improved grindi mg concaves andscreens and an improved general arrangement of the casing and `frameparts.

Figure 1 is a side elevation of a ulverizer containing my improvements.Fig. 2 is a rear elevation of the lower part of the pulverizer, theconveying devices bein lremoved. Fig. 3 is a sectional view in e evationof the-machine. Figs.'4L and 5 show -the construction of the hammersyand hammer supporting mechanism.` Fig. 6 is a detail sectlonaljview. ofthe feeder housing tak'en in a plane at right angles tothe plane of Fig.3 looking toward the front of the machine and along the line 6 6 of Fig.1.

In the drawings, 1 designates the base on which is mounted and to whichis suitably secured the casing 2. I prefer to make the base l and casing2 as generally rectangular, box-like structures, with the open top ofthe base lying next to the openbottom of the casing. In the" top of theside walls of the base and preferably between the base and the casingare mounted suitable bearing boxes for the hammer-carrying shaft 3.

The opposite side walls 5--5 of the upper casing 2 are made withsemicircular recesses 6-G 1n their lower edges. The semicircular plates717 aresecured to the side walls 5-5 over theserecesses by means of cascrews 8 A and it closely around the bearing oxes 4.

The great speed at which the main shaft 3 rotates-when the machine 'isin o eration, and the heavy work done b the iiammers which it carries,requires requent rebabi bitting of the bearing boxes 4. In machines asusually built heretofore, it has been necessary to remove the entireupper portion of the machine housin to rebabbitt the bearing boxes. When1t becomes necessary to rebabbitt a machine constructed according ment.

to this invention, the side plates/7 are removed, the upper and lowerhalves of the bearing boxes separated and the shaft raised from itsusual position, ready access being thereby given to the bearing boxparts.

The shaft 3 carries `the hammer-supporting bars 9 having the radiallyextending arms l0 and the central hubs 1l. These hubs 11, which are 'ofrelatively greater thickness than the arms which theyI carry, abutagainst one another in a continuous row and are secured in any desirablemanner against rotation with respect to the shaft 3, as by thc key l1".These hammer supports may have any desired number of arms, those in thedrawings being shown for the purpose of illustration with four sucharms, each two of the arms being 90 apart. The hammer supports arearranged in two sets, each set comprising alternate supports. As to theposition of the arms, the supports in one set are displaced 45 withrespect to the supports of the other set. Mounted in the outer' ends ofthe arms 10 are the cross rods 12 which extend from end to end of themachine.

The outer hammer supports upon each end of the shaft are diiierentlyconstructed from the others, each of these end supports being a diskplate 13 provided at its center with a hub 14: and at its periphery withthe outwardly extending rim angel5. The cross rods 12 of each helicalseries are extended through these end plates 13 and secured by splitpins 16 against longitudinal displace- Upon these cross rods 12 thehammers are pivotally mounted in helical rows about the circumference ofthe machine. rlhe angular displacement between Ieach two sets of hammersupports makes this helical` the whole grinding concave is covered byone half revolution of the shaft. Other advantages gained by thishelical arrangement of the hammers are the lack of vibration, especiallyin comparison with a machine of the lolder type, where several hammers1n one row may becomey worn more than the hammers in another row; a moreuniform and gradual attack on fresh material; ease of starting themachine from rest; and decreased proba-bility of the machine becomingclogged.

Broadly speakiiw, hammers constructed according to my invention are madewith working surfaces presenting a curvilinear contour in crosssectional planes. One con venient and easily manufactured hammer withsuch a curvilinear working surface vis of the hammers willl be vto drawthe material under and between the hammers and concave. It will also beobserved that the hammer is yieldable centrally so that when suddenobstructions, such as unusually large pieces of material or metal,partsaccidentall-y fed to the machine are encountered, they are passedwithout injury to the hammers or to the machineA generally. In additionto striking the material these hammers also roll upon and, due tocentrifugal force, crush the material against the concave. I find inpractice that these hammers can be made of cast iron with chilledwearing surfaces, whereas the hammers formerly used were made fordurability of expensive carbon steel.

I have also shown in the drawings an alternate form of hammer 17 which Ihave found' desirable to use in conjunction with the ring` hammer 16a.These hammers 17 are similar to the common hammers now in use, with theexception thattheir 'outer ends are enlarged and rounded so as to have aworking face similar to the working face of the ring hann'ners 1G22 Ihave found it desirable for grinding most kinds of material to combinewith the two kinds of hammers already described or with the ring`hammers alone, hammers of the well known plane bar type, indicated onthe drawings by 18. These hammers serve not only to pulverize thematerial by attrition but also serve to stir up and agitate any materialwhich ythe other hammers have compress-'ed against' the grindingsurface.

The easing 2 is eiilarged upwardly above the rotary parts. The materialwhich is thrown by the hammers into the empty space 19, thus'formed inthe upper part of lthe casing,

K/ strikes other particles of material which have been previously thrown'against the u-pper top wall of the casing. or which may be falling fromthe feed opening. This impact of the pieces of material, one upon theother, assists in the pulverizing process, and the heat lgenerated bythe attrition causes the moisture to be evaporated from damp materialand obviates the necessity for steam heating pipes, such as are now verycommonly used.

The feed ,opening 2O is situated in that side of the small housing 21,mounted on top of the casing, which is flush with the side wall of thecasing. 'lhe feed opening is therefore out of line with the materialwhich moves upward under the blows of the hainmers, and nothing can beat. any time ejected from the casing. 'This feed opening is protected bythe inwardly swinging door '22. The air `pressure generated by therapidly moving hammersis suilicient to keep this door normally closed,while, at the same time, fresh material can be readily fed into themachine, pushing the door QQ inwardly open as it enters, I prefer tomake the door,

of yiel'dable cloth. l

The grinding concaves` 23, 24. and 25 are,

-mounted in close proximity tothe lower half of the outer circles ofrotation of the hammers. The first of these concavesI Q3 is im perforateand mounted at its lower end upon the hinge rod 27. The upper extremity28 rests in fixed position upon the rod 29. The rods 27 and 29 aresecured in the side walls of the base. rlhe forward end of the lowerconcave 24E, which is likewise imperforate, is pivotally mounted uponthe rod 30 which is carried by the walls of the base. The rear end ofthis concave 24 is adjustable about its forward end as an axis, theproximityof the rearend to the outer ends ofthe hammers determiningl thedegree of tineness to which the material is ground the rolling orrubbing.v

action of the hammers 16a and 17 tending to crush the material againstthe concaves 23 and Q4 until the materialis pulverized to a degree oftineness such that the hammers can no longer act upon it. Thenuiterial'is gradually forced along by the continued action of thehammers, until it is finally discharged through the space in thecon'cave25. The

adjustment of the concave 24 is effected by means of the wedge blockSi.. The position of the wedge is changedby loosening the nuts 33and'moving the bolt 34, fixedly carj ried by this wedge block, baclnvardand forward i-n the slots 35 of the base walls. The third andi-eargrinding concave is formed of a plurality of bars spaced apart andhinged at one end'. as in the drawings at their lower end, by means ofthe hook 36, to the hinge rod-37 vand at their other end,

supported in position the rod 3S which engages the ange 39 of the gratebars.

-more easily yticularly when the material is of a damp and These gratebars are spaced apart in any suitable manner. As shown in the drawings,the barsl are all cast in one piece, adjacent bars being integrallyconnected at each end.

The circumferential. as against transverse arran ement ofthe slots ofthe concave, has the a vantage of allowing the material to be ejectedfrom the machine, parsticky character. It is almost im ossible to clog amachine equipped witlrthis kind of a grinding concave. The wear upon thebars is also considerably less, and the liability of the bars being bentdecreased.

The endless bucket conveyer, indicated as a whole at 40, is mounted topass veryclose to the rear concave and to carry the material away fromthe outside face of the concave as fast as it is thrown through theopenings. Considerable difficulty has'been ex erienced 'in-the cloggingof the openings o the concaves, as the conveyers genera ly used havebeen ofthe horizontally moving type, upon which the material hasobeendropped. By using a bucket conveyer and causing the scooping edges ofthe buckets to cut close to the outside surface of the concave, anyclogging of thematerial in the concave opening is effectuallj;prevented.

The base of the machine is provided with extending-lateral guard plates4l hinged to swing outwardly on the hinges 43 and the floor 42, ybothwalls and floor adapted to lie very close to the edges of the buckets ofthe conveyer as they' pass in front of the discharge opening. By thisdevice, the material is prevented from clogging the discharge opening,very little dustescapes; and ready access can be had to the lower end ofthe conveyer and adjacent parts of the pulverizing machine by swingingback the side guards 41.

When it becomes necessary to have access to the interior of the machineor to replace a worn concave, the supporting rods 27, 28, 30, 37, 3S canbe readily removed and the concaves taken from position. If the conveyerabove described is not used, the forward or rear concave can ybe freedat its upper end and swung down to permit inspection and cleaning of theinterior of the machine. y,

When the material to be ground is extremely wet or sticky so that itwould tend to-clog the grate or slotted concave 25, the lattermay beentirely removed from the machine by withdrawing the rods 37 and 38,

thu'spermitting the pulverized `material toy be freely discharged fromthe pulverizer and removed by the conveyer O. What I claim isl l 1. In apulverizing machine, the combination of a rotatable hammer carryingmechanism, grinding rings mounted on the hammer carrying mechanism, soas to' be free to rotate on their own axes and so as to be -centrallyyieldable, hammers pivotally mounted on the said hammer carryingmechanism and a concave grinding surface adapted to coperate with thevrings and hammers, substantially as set forth.

2. In a pulverizing machine, the combination of a rotatable hammercarrying mechanism, grinding rings "mounted on' the hammer carryingmechanism, so as to be free to rotate on their own axes 4and so as to becei'ltrallyyieldable, hammers pivotlally mounted on the said hammercarrying mechanism, and a concave discharge grating adapted to cooperatewith the rings and hammers, substantially as set forth.

43. In a pulverizing machine, the combination of a Vconcave grindingsurface, a concave discharge'grating, rotatable hammer carryingmechanlsm, grlnding rings mounted on the hammer carrying mechanism so asto be free to rotate on their own axes, so as to be centrally yieldable,and'so as lto be capable of swinging laterally in relation to the hammercarrying mechanism, and hammers pivotallv mounted on the said hammercarrying mechanism and adapted to agitate the material 011 the grindingsurface and onI thedischargegrating, substantially as set forth.

4. In a pulverizing machine, the combination of a rotatable horizontalshaft, hammer supports mounted on the shaft, supporting pins parallel tothe shaft and passing through the hammer supports, hammers mounted onthe pins, some of the hammers being grinding rings free to revolve uponthe pins about their own axes and some of the hammers being rectangularand pivotbottom in close proximlty to the rings and hammers,substantially as set forth.

5. In a pulverizing machine, the combination with a rotatable hammercarrying mechanism, of a plurality of grinding rings mounted on thehammer carrying mechanism so as. to be free to rotate on their own axes,and hammers pivotally mounted on the hammer carrying mechanism, eachpivoted hammer being behind and overlapping a grinding ring, and aconcave grindlng bottom in close proximity to the rings and hammers,substantially as set forth.

6. In a pulverizing machine, the combination with a rotatable hammercarrying mechanism, of a plurality of grinding rings mounted on thehammer carrying mechanism so as to be free to rotate about their ownaxes, and hammers pivotally mounted `on the hammer carrying mechanism,each pivoted hammer being behind and overlapping a grinding ring', animperforate ally mounted upon the pins, and a grinding forth.

7. Ina pulverizing machine, the combination of a supporting structure, arotatable ringj,y carrying mechanism, crushing rings,

mounted on the ring carrying mechanism so to be centrally yieldable andcapable 1 ofy rotation about their own axes, a concave grinding surfaceadapted to cooperate with the said crushing rings, the said surfacebeing provided with discharge slots parallel to the motion of the ringsand located at the end of the grinding surface, substantially as setforth.

8. In a' pulverizing machine, the coinbination of a concave pulverizingsurface,

a concave discharge grating, a rotatable shaft, hannners ha ving convexworking siii'- faces with radii less than the radius of the pulverizingsurface and discharge grating, the said hammers being so mounted onC the'shaft as to be yieldable centrally, to be caable of swinging .laterallyin relation to the shaft and capable yof rolling in relation to thepulverizing surface and discharge grating, a part of the pulverizingsurface being adjustable toward or away -from the hammers, substantiallyas set fort-h.

9.v In a pulverizinginachine, the combination of a concave pulverizingsurface, a rotatable shaft, hammers having convex Working surfaces withradii less than .the

radius of the pulverizing surface, the said- 4whamirers being so mountedon the shaft as to be centrally yieldable, to be capable of swinginglaterally in relation to the shaft,

and capable of rolling in relation to the pulverizing surface, a part ofthe pulverizing surface being adjustable toward or away from thehammers, substantially as set forth.

10. In a pulverizing'machine, the combination with a frame and casing,of rotatable hammer carrying mechanism, a pivotally supportedimperforate concave bottom grinding plate, a longitudinally movableWedge support-ing the free end of said grinding plate, fastening boltsrigidly car-V ried by said wedge and projecting through the saidgrinding bottom and screen; being in close proximity to the t t the sidewalls of the casing, nuts for clamping said bolts in position and ahorizontal y support for said wedge, substantially as forth.

11. In a -pulverizing machine,` the com- Ibnation of a rotatable hammercarrying mechanism, grinding cylinders mounted on the hammer ,carryingmechanism, ia casing surrounding said hammer cai rying mechanism vandhaving a feed open- |ing, a grinding surface adapted tocol operate withthe grinding cylinders and a discharge opening, a gratingnormally-.covlering the discharge opening and adapted to be removedtherefrom, the said grating being also adapted toA cooperate when innormal position with the grinding cylinders, the feed opening and thedischarge opening being located on opposite sides of theham- 12. In apulverizing machine, the coins` bination of a rotatable ring carryingmecht anism, rings mounted on the said mechanism, so as to be centrallyyieldable and capable l of rotation about their own axes, a concave l`grinding surface beneath. the rings and eX- tending-throughapproximately 1809, and a casing inclosing anempty space above thehammers, substantially as setforth.

13. In a pulverizing machine, the combination of a rotary horizontalhammer carryingmechanism, rings mounted on-the said hammer carryingmechanism, so as to be Vcentrally yieldable and capable of rotationabout their own axes, a concave grinding surface adapted to coperatewith the said ring hammers, and a casing inclosing an empty space abovethe hammers, the said casing having a feed opening so located that theentering material will fallu directly. upon the hammers, substantiallyas set forth. l

In testimony whereof I affix my signatwo witnesses.

HENRY A. GOETZ.

l ture, in presence of Witnesses:

J. F. GRUBBs, E. E. KAPPER.

nier mechanism whereby material passing' lIt is hereby certified that inLetters Patent No. 945,160, grunted January 4, 1910, upon theapplication of Henry A. Goetz, `of New Albany, Indiana, for animprovement in Pulverizers, an error appears in the printed,specification requiring correction as follows: Page 4, line 2, for theword gate read grate;

and that the said Letters Patent should be read with this correctiontherein that the same may conform to the record of the case in thePatent Office.

, Signed and sealed this 5th day of March, A. D., 1912.

C. C. BILLINGS,

Acting Commissioner of Patents.

[SEAL]

